Abstract
The paper presents an adaptive rate control framework, which performs proactive rate control based on packet loss prediction and on-line audio quality assessment for real-time packet audio. The proposed framework determines the optimal combination of various audio codecs for transmission, utilizing a thorough analysis of audio quality based on individual codec characteristics, as opposed to the ad-hoc codec redundancy used by other approaches. As a main component of this framework, a preliminary formulation of the packet loss predictor is shown; it determines the likelihood of packet loss in terms of available bandwidth, delay variation trend, and network history. We present simulation and experimental results to show the accuracy and efficiency of this technique.
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